Electrical welding apparatus.



J. BAEGKMANN.

ELEGTRIGAL wmmne APPARATUS. APPLICATION TILED JULY 1.1909.

1,01 9,017 Patented Mar. "5, 11912.

W' es s Jyvenlor;

JOHANNES BEGKMANN, F ALTONA, OTTENSEN, GERMANY.

ELECTRICAL WELDING APPARATUS.

Specification of Letters Patent.

Application filed July 1, 1909. Serial No. 505,395.

- TolaZZ whom it may concern:

Be it known that I, JOHANNES Bron- MANN, a subject of'the German Emperor,

and resident ofA ltona, Ottensen, Germany, have lnventedcertaln new and useful Improvements in Electrical Weld ng Apparatus, of which the following'is"a specification. This invention relates to electrical welding apparatus.

The apparatus forming the present in vention comprises a main or welding circuit,

a resistance being included in the main circult, and a shunt c1rcu1t connected with the main or welding circuit, through which the current is passed when the welding ope'raw v ,tion is interrupted. The shunt circuit is closed by means'of the provision of an electromagnet con-tact having a core ofsoft iron, included in the main circuit, which, when the latter is closed, attracts a contact hammer located below the electr'omagnet. The shunt circuit'is then open, but when the welding operation is interrupted, the contact hammer instantly drops upon a carbon block arranged therebelow, by which operation the shunt circuit is closed. The resistance included' inQ the main circuit and which now .fo sa part of the shunt circuit takes up the" f shockdue to the breaking of, the circu t this-preventing the transmission o t'iiiide sirable shocks to the dynamo or generator which furnishes current to, the circuits. i r

According to the present invention metal rods are used in place of carbon electrodes for producingjhe 'welding arc, said metal rods servingsin'iultaneously' as welding solder. The sameflinaterial from which the work piece'is made can be used as welding solder; for instance iron work pieces can -'be welded with iron rods as welding solder,

but the same can also be welded with copper rods; andweldings-of all other metals or metal compositions such as brass,aluminium, platinum and the like can be made in the same manner.

A special advantage of the present welding apparatus using metal rodsas electrodes rests-in the feature, according to which a comparatively low voltage may be used,

eliminating thereby any danger for the workman.

A further advantage consists therein that the easily melting materials, such as sulfur,

carbon, phosphorus and thelike which are co-ntainedin the Work piecesto be welded and which, when using the carbon arc, vola-.

tilize on account of the great heat produccd, remain according to this process in the material of the work piece; according to this inventionthe work pieces are only heat ed to a comparatively low'degree, so that the same can keep their original compositions on. the weld and a uniform, tight, and

' soft welding is obtained.

A form of construction of such" welding apparatus is illustrated in theaccompany ing drawing. Referring now particularly to the drawing: The one pole line from thedynamo a passes through the regulating resistance 6 and at point I) the line separates into amain line b and shunt line b passes through the electromagnet c to the keeper 8 of the welding solder (Z. The other pole line It passes from the dynamo a to the work piece 0. The electromagnet c isprovided with an armature 9 arranged below the same, and below said armature isarranged a carbon block'f serving as a contact for the armature g. The shunt line b is connected with the armature g, and connecting the carbon block f and line it is a .wire connection m. As long as the main circuit, which is the welding circuit, is closed, the current passes through the electromagnet, so that the contact hammer g is attracted by the soft iron core- 11 of the electromagnet and remains out of contact with the carbon block f. After the interruption of the main circuit, for instance when the solder (Z is removed from the work piece, the iron core releases the contact hammer g which at once drops upon the carbon block 'f, by which operation the shunt circuit is closed'through. wire Z1 contact hammer 9, contact f, and wire m, the circuit of course including the resistance 7), the wire it, and the source of current. The electrical return shock produced by the interruption of the maincircuit is taken up by the resistance 6, while the dynamo receives no selfinduced shocks. 4 I'claim of electrical energy, a main circuit therefrom containing a resistance, an electromagnet and a welding electrode, an, armature for said electromagnet, a contact for said armature having electrical connection there- 1. Welding apparatus comprisingasource Patented Mar. 5,1912

The main line 6 with when the armature is unattracte'd by said electromagnet, a shunt circuit from said main circuit, said shunt, circuit including said armature' and said contact and being adapted to be closed upon't-he breaking of the main circuit whereby the electromagnet is de'einergized and the armature falls and makes electrical connection with said contact block. v

2. Welding apparatus comprising'a source of electrical energy, a. main circuit therefrom containing a resistance,

net and a welding electrode, a shunt circuit ,from said main circuit and a contact device insaid shunt circuit in coaction' with said electromagnet for closing said shunt circuit automatically upon opening of the main circult."

3. Welding apparatus comprisinga'source of electrical'energy, an electromagnet electrically connected with said source, a welding electrode electrically connected with said an electromag-- block,

electromagnet, a return line to the said source from the work piece, a resistance in electr1- cal connectionwith said source of electrical energy, an armature for said electromagnet electrically connected with said resistance, a

contact block for said armature adapted to be electrically connected therewith whenthe armature is unattracted by the said electromagnet, and an electrical connection between said return wire and said cont-act said electrical connection, saidretnrn Wire, contact block, armature and resistance forming a circuit which is adapted to be closed upon the denergizing of said electromagnet when the welding operation is 'interrupted. l

Y J OHANNES BECKMANN.

Witnesses M. PASTOR, H. LEMKE. 

